Pencil sharpener



FIG. 1 is a front perspective view of a pencil sharpener;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a side elevation view thereof;

FIG. 4 is an opposite side elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines showing features in FIGS. 1, 2, 5, 6, and 7 are included for the purpose of illustrating portions of the pencil sharpener that form no part of the claimed design. 

The ornamental design for a pencil sharpener, as shown and described. 